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Webinar: Variations in Visual Sensitivity & Color Matching Functions

March 31, 2021 | 12:00 pm - 1:00 pm EDT

Free – $10
IES Buffalo Section

Lighting is overwhelmingly designed for human observers, whose individual visual sensitivities are as varied as their height and hair color. Standardization of colorimetry has necessitated selecting a sort of average visual color sensitivity as color matching functions, which are the foundation of basic quantities including luminous flux, correlated color temperature, chromaticity, and color rendition. However, the realities of natural variation in visual color sensitivity – even among those who would be considered to have normal color vision – means that colors that match according to a standard can mismatch to individual observers. Spectral power distributions with steep transitions and/or narrow-band emissions can exacerbate these mismatches, also called observer-induced metamerism failure (or simply observer metamerism: OM).

This presentation will review the basics of human color vision, relating fundamental cone cell spectral sensitivities to the color matching functions standardized by the CIE in 1931, 1964, and 2015. Physiological variations in the eye will be connected to differences in visual color sensitivity and quantified in terms of expected population variations. The effects of these variations in terms of observer metamerism and a loss in precision in measures such as color rendition will be explored, and the effects of spectral power distribution and color primaries on the magnitude of observer metamerism will be shown. Finally, an update will be shared on current work in the IES Color Committee to redefine colorimetric quantities CCT and Duv using the CIE 2015 10-degree fundamental color matching functions.

We look forward to welcoming you to our virtual meeting.

Our Speaker: Michael J. Murdoch, PhD, Assistant Professor
Munsell Color Science Laboratory at the Rochester Institute of Technology
Michael J. Murdoch teaches colorimetry, psychophysics, Matlab programming, lighting, and imaging. His current research interests include the effects of temporally dynamic lighting on visual adaptation, inter-observer differences, and color appearance and visual adaptation in augmented/mixed reality, and he currently supervises the research of 5 PhD students. Michael’s education includes a BS in chemical engineering from Cornell, an MS in computer science from RIT, and a PhD in human-technology interaction from Eindhoven University of Technology. Michael serves on the Board of Directors of the Inter-Society Color Council (ISCC) and is active in the Society for Imaging Science & Technology (IS&T). He serves on several Task Groups in the IES Color Committee.

Please Join Us March 31, 2021 12:00 pm – 1:00 pm
Virtual Seminar via Microsoft Teams
11:50 am Sign In via Teams
12:00 pm Presentation
12:50 pm Moderated Q/A

1.0 PDH

IES/AIA Member $0
IES/AIA Non-Member $10


March 31, 2021
12:00 pm - 1:00 pm EDT
Free – $10
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